Effect of carbon nanotube content and double-pressing double-sintering method on the tensile strength and bending streng
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In this research work, planetary ball mill has been used to disperse carbon nanotubes (CNTs) in Al powders. Al-CNT nanocomposite samples have been produced using double pressing double sintering (DPDS) method. The effects of CNTs weight percent and secondary pressing and sintering on the hardness, tensile, and bending strength of Al-CNTs nanocomposites were investigated. Enhancements of about 98% in hardness, 40% in tensile strength, and 20% in bending strength of Al-CNTs nanocomposites were observed as compared with pure Al samples. Using DPDS technique increments of 2.4–16.14% in density has been obtained as compared with the nanocomposites produced by conventional sintering method. The composites were studied by scanning electron microscope and differential thermal analysis. The X-ray diffraction (XRD) was used to identify various phases if present in Al-CNTs nanocomposites.
I. INTRODUCTION
Metal matrix composite (MMC) is engineered combination of the metal (matrix) and hard particle (reinforcement) to get tailored properties. MMCs are either in use or prototyping for the space shuttle, commercial airliners, electronic substrates, automobiles, golf clubs, and a variety of other applications.1–7 Carbon nanotubes (CNTs), due to their singular one or multilayer tubal graphene structure, have great attention for structural and functional uses.8–10 CNTs have attracted much attention due to their special atomic structure and enchant mechanical properties (elastic modulus ;1 TPa and strength ;30 GPa)11–13 as well as excellent thermal properties and good electrical properties.11,12 Excellent properties make CNTs ideal fibrous reinforcements for composites materials. In the past 20 years, CNTs reinforced composites in various matrices have been studied intensively for applications in the next generation of strong structural materials.8,14 Up to now, however, the reported mechanical properties of CNT reinforced composites are still much lower than awaited. Also the understanding of the fracturing behavior of CNTs in composites is basically necessary to the design of high-strength composite materials.8,15,16 Among many candidates, matrix materials for light weight high-strength composites, aluminum has been
Contributing Editor: Jürgen Eckert a) Address all correspondence to this author. e-mail: [email protected] DOI: 10.1557/jmr.2016.446
considered preferentially due to its relatively low density and reasonable mechanical properties. In fact, the interest in CNT-reinforced aluminum composites has been growing substantially. The shared aim of the various groups is to produce composites with enhanced mechanical properties. Such composites would make attractive novel materials with potential applications in the aerospace, automotive, and sports industries where light weight combined with high stiffness and strength is desired. The optimum CNT content at which maximum enhancement was achieved varied depending on mixing and preparation techniques. Powder metallurgy (PM) techniques have been the preferred route for most r
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